Effect of temperature on formation and evolution of solid electrolyte in terphase on Si@Graphite@C anodes

作     者：Hong Dong Jie Wang Peng Wang Hao Ding Ru Song Ning-Shuang Zhang Dong-Ni Zhao Li-Juan Zhang Shi-You Li Hong Dong;Jie Wang;Peng Wang;Hao Ding;Ru Song;Ning-Shuang Zhang;Dong-Ni Zhao;Li-Juan Zhang;Shi-You Li

作者机构：College of Petrochemical TechnologyLanzhou University of TechnologyLanzhou 730050GansuChina Gansu Key Laboratory of Low-Carbon Energy and Chemical EngineeringLanzhou 730050GansuChina College of Chemistry and Chemical EngineeringQinghai University for NationalitiesXining 810007QinghaiChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第1期

页      面：190-200,I0006页

核心收录：

学科分类：081704[工学-应用化学] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China(51962019) the Major Science and Technology Projects of Gansu Province(18ZD2FA012) the Natural Science Foundation of Qinghai Province of China for Youth Project(2019-ZJ-938Q) the Qinghai Science and Technology Plan(2019-ZJ-7038) the Hongliu First-class Discipline Construction Program of Lanzhou University of Technology 

主　　题：In-situ EIS Solid electrolyte in terphase Formation Evolution Si@Graphite@C anodes 

摘      要：Studies on the formati on and evolutio n of the solid electrolyte in terface(SEI)film under different ambient temperatures are important to understand the failure behavior of lithium-ion batteries(LIBs).Herein,in-situ electrochemical impedance spectroscopy(EIS)test is performed on the whole discharge process of Si@Graphite@C/Li cell at 0,25 and 55℃,*** with scanning electron microscopy,transmission electron microscopy and X-ray photoelectron spectroscopy characterizations,it is found that the SEI film undergoes a complicated evolution process of pre-formation,self-improvement and gradual decay in succession at 25℃.Besides,due to the dissolution of organo-alkyl lithium at high temperature,the formed film is mainly composed of LiF,Li_(2)CO_(3) and other in organic salts,which helps to decrease the ***,the electrolyte is consumed continuously on the new exposed in terface,leading to the degraded performance of the ***,the dyn amic properties of Li^(+) ions are poor at low temperature,though the migration ability of Li^(+) ions in the solid phase can be improved as the cycle goes ***,the development and application of in-situ EIS tech no logy are expected to become an important means to explain the electrochemical performance of batteries.